:root {
      --primary: #7b2cbf;
      --primary-light: #9d4edd;
      --primary-soft: #f3e8ff;
      --primary-dark: #5a189a;
      --accent: #c77dff;
      --accent-glow: #e0aaff;
      --text-main: #1f1a24;
      --text-muted: #5e5568;
      --bg-page: #faf7fd;
      --bg-surface: #ffffff;
      --bg-alt: #f5f0fc;
      --border-color: #ebdff7;
      --card-shadow: 0 10px 30px -5px rgba(123, 44, 191, 0.08);
      --card-shadow-hover: 0 16px 36px -4px rgba(123, 44, 191, 0.16);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.28s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      background-image: radial-gradient(circle at 10% 10%, rgba(157, 78, 221, 0.05) 0%, transparent 40%), radial-gradient(circle at 90% 90%, rgba(199, 125, 255, 0.06) 0%, transparent 50%);
      background-attachment: fixed;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 16px rgba(123, 44, 191, 0.05);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      gap: 0;
      align-items: center;
      list-style: none;
    }

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: var(--primary-soft);
    }

    .nav-cta-btn {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: #ffffff !important;
      padding: 8px 18px !important;
      border-radius: 30px !important;
      font-weight: 600 !important;
      box-shadow: 0 4px 14px rgba(123, 44, 191, 0.25);
    }

    .nav-cta-btn:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 18px rgba(123, 44, 191, 0.35);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 6px 10px;
      border-radius: 6px;
      cursor: pointer;
      color: var(--primary-dark);
    }

    .hero-section {
      padding: 70px 0 60px;
      text-align: center;
      position: relative;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--primary-soft);
      border: 1px solid rgba(157, 78, 221, 0.3);
      color: var(--primary-dark);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--primary-dark);
      max-width: 900px;
      margin: 0 auto 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto 34px;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .btn-primary-lg {
      background: linear-gradient(135deg, #7b2cbf 0%, #9d4edd 100%);
      color: #ffffff;
      padding: 14px 34px;
      border-radius: 32px;
      font-size: 1.05rem;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 8px 24px rgba(123, 44, 191, 0.32);
    }

    .btn-primary-lg:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(123, 44, 191, 0.42);
      color: #ffffff;
    }

    .btn-secondary-lg {
      background: #ffffff;
      color: var(--primary);
      border: 2px solid var(--primary-light);
      padding: 12px 30px;
      border-radius: 32px;
      font-size: 1.05rem;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .btn-secondary-lg:hover {
      background: var(--primary-soft);
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }

    .stat-card {
      background: #ffffff;
      padding: 22px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--accent);
    }

    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    .section-wrap {
      padding: 70px 0;
    }

    .section-wrap.alt-bg {
      background: var(--bg-alt);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      margin-bottom: 46px;
    }

    .section-badge {
      display: inline-block;
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      background: var(--primary-soft);
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 10px;
    }

    .section-title {
      font-size: 2rem;
      color: var(--text-main);
      font-weight: 800;
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
    }

    .model-tags-wrapper {
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      margin-bottom: 40px;
    }

    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .model-chip {
      background: var(--bg-page);
      border: 1px solid var(--border-color);
      color: var(--primary-dark);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 600;
      transition: var(--transition);
    }

    .model-chip:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--accent);
    }

    .card-icon {
      width: 50px;
      height: 50px;
      background: var(--primary-soft);
      color: var(--primary);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      font-weight: bold;
      font-size: 1.25rem;
    }

    .card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card p {
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

    .media-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }

    .media-img-container {
      width: 100%;
      height: 220px;
      overflow: hidden;
      background: #eee;
    }

    .media-img-container img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .media-card:hover .media-img-container img {
      transform: scale(1.05);
    }

    .media-body {
      padding: 22px;
    }

    .media-body h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-item {
      position: relative;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      text-align: center;
      box-shadow: var(--card-shadow);
    }

    .step-num {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      box-shadow: 0 4px 10px rgba(123, 44, 191, 0.28);
    }

    .eval-highlight {
      background: linear-gradient(135deg, #7b2cbf 0%, #5a189a 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .eval-stars {
      color: #ffb703;
      font-size: 1.6rem;
      letter-spacing: 4px;
      margin-bottom: 8px;
    }

    .eval-score {
      font-size: 3.2rem;
      font-weight: 900;
      line-height: 1;
      color: #ffffff;
    }

    .eval-score span {
      font-size: 1.3rem;
      font-weight: normal;
      color: rgba(255, 255, 255, 0.7);
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 680px;
      text-align: left;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .compare-table th {
      background: var(--primary-soft);
      color: var(--primary-dark);
      font-weight: 700;
    }

    .compare-table tr:hover {
      background: rgba(243, 232, 255, 0.3);
    }

    .tag-featured {
      background: var(--primary);
      color: #ffffff;
      padding: 4px 10px;
      border-radius: 12px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-soft);
      color: var(--primary);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--accent);
    }

    .user-info h4 {
      font-size: 0.96rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-info span {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .faq-list {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }

    .faq-question {
      padding: 18px 22px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.02rem;
      color: var(--primary-dark);
      transition: var(--transition);
    }

    .faq-question:hover {
      background: var(--primary-soft);
    }

    .faq-arrow {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #ffffff;
      color: var(--text-muted);
      font-size: 0.94rem;
      line-height: 1.7;
    }

    .faq-answer p {
      padding: 0 22px 20px;
    }

    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 34px;
      box-shadow: var(--card-shadow);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background: var(--bg-page);
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #fff;
      box-shadow: 0 0 0 3px rgba(157, 78, 221, 0.15);
    }

    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }

    .btn-submit {
      width: 100%;
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: #ffffff;
      border: none;
      padding: 14px;
      border-radius: var(--radius-sm);
      font-size: 1.05rem;
      font-weight: 700;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: 0 6px 18px rgba(123, 44, 191, 0.25);
    }

    .btn-submit:hover {
      opacity: 0.95;
      transform: translateY(-2px);
    }

    .contact-card-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 34px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 20px;
    }

    .qr-container {
      display: flex;
      align-items: center;
      gap: 20px;
      padding: 16px;
      background: var(--primary-soft);
      border-radius: var(--radius-md);
    }

    .qr-container img {
      width: 100px;
      height: 100px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      background: #fff;
    }

    .contact-item-row {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.96rem;
      color: var(--text-main);
    }

    .contact-item-row strong {
      color: var(--primary-dark);
      min-width: 80px;
    }

    .article-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 16px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

    .article-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }

    .article-item a {
      font-weight: 600;
      color: var(--text-main);
      display: inline-block;
    }

    .article-item a:hover {
      color: var(--primary);
    }

    .article-date {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    .agent-box {
      background: linear-gradient(135deg, rgba(243, 232, 255, 0.8), rgba(224, 170, 255, 0.2));
      border: 2px dashed var(--accent);
      border-radius: var(--radius-lg);
      padding: 36px;
      text-align: center;
    }

    .site-footer {
      background: #20152b;
      color: #dfd7eb;
      padding: 50px 0 26px;
      border-top: 1px solid #38254c;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 16px;
      position: relative;
      padding-bottom: 8px;
    }

    .footer-col h4::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 28px;
      height: 2px;
      background: var(--accent);
    }

    .footer-col p {
      font-size: 0.9rem;
      line-height: 1.7;
      color: #bfaecf;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links li a {
      color: #bfaecf;
      font-size: 0.9rem;
    }

    .footer-links li a:hover {
      color: var(--accent-glow);
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .friend-links-list a {
      display: inline-block;
      color: #cfbde3;
      font-size: 0.88rem;
      background: rgba(255, 255, 255, 0.06);
      padding: 4px 10px;
      border-radius: 4px;
    }

    .friend-links-list a:hover {
      color: #ffffff;
      background: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 14px;
      font-size: 0.88rem;
      color: #a493b8;
    }

    .footer-bottom a {
      color: #a493b8;
    }

    .footer-bottom a:hover {
      color: #ffffff;
    }

    .float-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      border: none;
      box-shadow: 0 4px 16px rgba(123, 44, 191, 0.4);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      transition: var(--transition);
    }

    .float-btn:hover {
      transform: scale(1.1);
      background: var(--primary-light);
    }

    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .mobile-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        display: block;
        padding: 12px;
      }
      .eval-highlight {
        flex-direction: column;
        text-align: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }